Fix grammaro.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65727 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/LangRef.html b/docs/LangRef.html
index 5329a01..83ea026 100644
--- a/docs/LangRef.html
+++ b/docs/LangRef.html
@@ -2142,7 +2142,7 @@
 <pre>
   ret i32 5                       <i>; Return an integer value of 5</i>
   ret void                        <i>; Return from a void function</i>
-  ret { i32, i8 } { i32 4, i8 2 } <i>; Return an struct of values 4 and 2</i>
+  ret { i32, i8 } { i32 4, i8 2 } <i>; Return a struct of values 4 and 2</i>
 </pre>
 
 <p>Note that the code generator does not yet fully support large